Explanation:

Researchers in the Philippines announced that they have discovered a species of ancient human previously unknown to science named Homo luzonensis. The species is dubbed Homo luzonensis, after the island of Luzon in Philippines. The researchers from France, the Philippines and Australia found the remains in the Callo Cave, where a bone dating back 67,000 years was discovered in 2007. Thus it was initially named Callao Man. It lived on the island of Luzon in Philippines at least 50,000 to 67,000 years ago. The hominin has been identified from a total of seven teeth and six small bones. The fossils unearthed suggests that the small-bodied hominin were less than 4 feet tall and most likely walked upright. It is not a direct ancestor of modern day humans, but rather a distant ancient relative. Luzonensis also has curved finger and toe bones, suggesting climbing may have been an important part of its behaviour. Hence, option (a) is the correct answer.